Auxiliary unit for face mask to avoid ears being used for anchoring earloops

ABSTRACT

An auxiliary unit for a face mask with earloops comprises a rectangular or oval main body, the main body includes first and opposite second end. At least one first hanger and more than one second hangers are arranged on the main body, the first hanger being close to the first end while the second hangers are closer to the second end. The wearer hangs one of loops of the mask on the first hanger and selects one second hanger for securing the other loop, depending on his head circumstances, therefore, the auxiliary unit releases ears from pressures of anchoring the face mask loops and improves experiences of wearing the face mask.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to China Application No. 202121640949.X, having a filing date of Jul. 19, 2021, filed in China State Intellectual Property Administration, the entire contents of which is hereby incorporate by reference.

FIELD

The subject matter relates to a face mask, and more particularly, to an auxiliary unit for earloop face masks.

BACKGROUND

Face masks are commonly used. The wearer should keep the face mask over the face to cover the nose and mouth completely and secure the mask to his ears with elastic loops. The elastic loops of the face mask can be tight around the ears, leaving red marks, sometimes even making the wearer feel sick and dizzy.

SUMMARY

An objective of the present disclosure is achieved by providing an auxiliary unit for a face mask with earloops, a wearer could wear the auxiliary unit behind his head by securing the loops to the auxiliary unit instead of his ears, the auxiliary unit provides a multistage adjusting range for various human head circumstances and improves the experience of wearing the face mask.

In order to achieve the purpose, technical solutions adopted by the present disclosure are as follows:

An aspect of the present disclosure provides an auxiliary unit for face mask comprising:

a main body with a rectangle or an oval structure, the main body comprising a first end and a second end opposite to the first end, the first and the second ends being extendable in an extension direction thereof; and

at least one first hanger and a plurality of second hangers arranged on the main body;

wherein the at least one first hanger is arranged close to the first end, the plurality of second hangers are arranged close to the second end and arranged in the extension direction of the main body; the at least one first hanger and the plurality of second hangers are configured for securing and anchoring two loops of an earloop face mask;

wherein each of the first hanger is formed by a first slot and two second slots connected end to end, wherein one end of each of the second slots is connected to one end of the first slot and the other end of each of the second slots extends in a direction away from the second hangers;

wherein each of the plurality of second hangers is formed by a third slot and two fourth slots connected end to end, wherein one end of each of the fourth slots is connected to one end of the third slot and the other end of each of the fourth slots extends in a direction away from the first hanger.

The arrangement of at least one first hanger and multiple second hangers allows the wearer to hang one loop on the first hanger and select a second hanger for securing the second loop according to different head circumstances, therefore more various needs of the wearer can be satisfied. The first hanger, formed by the first slot and the second slots, and the second hanger, formed by the third slot and the fourth slots, enable a stable connection between the loops and the auxiliary unit.

According to a further aspect of the application, the number of the first hangers is equal to that of the second hangers, the first hangers are arranged in the extension direction of the main body and symmetrically relative to the second hangers.

More hangers and the symmetrical arrangement provide more options for wearers, therefore a broader range for various human head circumstances is provided.

According to a further aspect of the present application, a longitudinal direction of each first slot is perpendicular to the extension direction of the main body, and a length of the first slot closer to an outer edge of the main body is longer than a length of the first slot further away from the outer edge of the main body;

a longitudinal direction of each third slot is perpendicular to the extension direction of the main body, and a length of the third slot closer to an outer edge of the main body is longer than a length of the third slot further away from the outer edge of the main body.

With such arrangement, the closer to the wearer's ears that a loop is secured, the longer are the lengths of the first/third slots, as the loops are anchored at two ends of the first/third slots, sufficient distance is provided to keep minimal contact between the loops and the ears, therefore wearing such a face mask would be comfortable without the loops surrounding and rubbing the ears.

According to a further aspect of the present application, each of the second slots and the fourth slots is provided with a retaining hole at a free end, the diameter of the retaining hole is larger than the widths of second slot and fourth slot.

The retaining holes with larger diameter prevent the loops retained therein from slipping away to the second slots or the fourth slots.

According to a further aspect of the present application, each of the second slots and each of the fourth slots include a bending portion, the bending portion can bend the second/fourth slot in a direction perpendicular to the extension direction of the main body.

The bending portions limit movement of the loops secured on the hangers and prevent the loops from being offset.

According to a further aspect of the present application, the auxiliary unit comprises identifiers for each of the first hangers and each of the second hangers. Therefore, the wearer can identify the position of a hanger by touching the identifier.

According to a further aspect of the present application, the auxiliary unit comprises a recess for each hanger, the recess is arranged for hangers at the first/third slot.

When a wearer is securing the loops on the auxiliary unit, he pulls the loops through the first slot and the third slot, as each of the first slot and the third slot is formed with a broadened section by the recesses. The wearer can easily pass his fingers through the first slot and the third slot at the broadened section to hang the loop on respective hanger.

According to a further aspect of the present application, a recess configured for each of the first slots and each of the third slots, the recess is arranged to form a broaden section for each of the first and each of the third slots.

When a wearer wishes to use the auxiliary unit, he pulls the loops through the first slot and the third slot, as each of the first slot and each of the third slot is formed with a broadened section by the recesses, the wearer's fingers can easily pass through the first slot and the third slot at the broadened section to hang the loops on respective hangers.

According to a further aspect of the present application, each of the second and each of the fourth slots is arranged with a pair of teeth engaged with each other, each pair of teeth comprises a first tooth and a second tooth located on opposite side walls of each of the second and each of the fourth slots.

As the first tooth and the second tooth engage with each other, the loops in the second/fourth slot are prevented from slipping off.

According to a further aspect of the present application, the main body comprises a convex part and a flat part, the convex part is located between the first end and the second end and adjacent to outer edge of the main body. Therefore, the main body is a close fit on the wearer and the wearer is more comfortable.

According to a further aspect of the present application, the auxiliary unit further comprises four extension parts arranged at four corners of the main body respectively, wherein each of the extension parts is a sector of a circle being positioned with an arc side of the sector close to the wearer's ear, and the arc side of each extension part is fixed to the main body at one end and extends away from the main body at the other end, wherein the first hangers and the second hangers are arranged on the four extension parts, each of the first slots and each of the third slots are interrupted by the arc sides of the extension parts on the same end of the main body.

Therefore, the distance between the extension parts on same side of the main body increases as the arc sides extend, a receiving space is formed for the wearer's ear, thereby the loops secured on the hangers do not rub and bear down on top and bottom of ears, and it would be more comfortable to wear the face mask.

BRIEF DESCRIPTION OF THE DRAWINGS

Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.

FIG. 1 is a schematic view of an auxiliary unit for securing loops of face mask according to a first embodiment of the present disclosure.

FIG. 2 is a schematic view of an auxiliary unit according to a second embodiment of the present disclosure.

FIG. 3 shows the auxiliary unit in use.

FIG. 4 is a schematic view of an auxiliary unit according to a third embodiment of the present disclosure.

FIG. 5 is a schematic view of an auxiliary unit according to a fourth embodiment of the present disclosure.

FIG. 6 is a schematic view of an auxiliary unit according to a fifth embodiment of the present disclosure, in use.

In the drawings and in the detailed part of the description, the following reference numerals have been used:

Auxiliary unit for loops of face mask 100

Main body 10

First end 11

Second end 12

Convex part 13

Flat part 14

First hanger 20

First slot 21

Second slot 22

Retaining hole 221

Bending portion 222

Second hanger 30

Third slot 31

Fourth slot 32

Identifier 40

Recess 50

First teeth 60

Second teeth 70

Extension part 80

loop

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous components. The description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

It should be understood that, the terms “first” and “second” are used to distinguish elements and are not used to denote a particular order or imply a number of technical features, therefore, unless being specifically defined, features described with “first” and “second” may expressly or implicitly include one or more of the stated features. In the description of the present application, “plurality” means two or more, unless otherwise expressly and specifically defined.

In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described.

The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.

In order to achieve the purpose, technical solutions adopted by the present disclosure are as follows:

An aspect of the present disclosure provides an auxiliary unit for face mask comprising:

a main body with a rectangle or an oval structure, the main body comprising a first end and a second end opposite to the first end, the first and the second ends being extendable in an extension direction thereof; and

at least one first hanger and a plurality of second hangers arranged on the main body;

wherein the at least one first hanger is arranged close to the first end, the plurality of second hangers are arranged close to the second end and arranged in the extension direction of the main body; the at least one first hanger and the plurality of second hangers are configured for securing and anchoring two loops of an earloop face mask;

wherein each of the first hanger is formed by a first slot and two second slots connected end to end, wherein one end of each of the second slots is connected to one end of the first slot and the other end of each of the second slots extends in a direction away from the second hangers;

wherein each of the plurality of second hangers is formed by a third slot and two fourth slots connected end to end, wherein one end of each of the fourth slots is connected to one end of the third slot and the other end of each of the fourth slots extends in a direction away from the first hanger.

The arrangement of at least one first hanger and multiple second hangers allows the wearer to hang one loop on the first hanger and select a second hanger for securing the second loop according to different head circumstances, therefore more various needs of the wearer can be satisfied. The first hanger, formed by the first slot and the second slots, and the second hanger, formed by the third slot and the fourth slots, enable a stable connection between the loops and the auxiliary unit.

According to a further aspect of the application, the number of the first hangers is equal to that of the second hangers, the first hangers are arranged in the extension direction of the main body and symmetrically relative to the second hangers.

More hangers and the symmetrical arrangement provide more options for wearers, therefore a broader range for various human head circumstances is provided.

According to a further aspect of the present application, a longitudinal direction of each first slot is perpendicular to the extension direction of the main body, and a length of the first slot closer to an outer edge of the main body is longer than a length of the first slot further away from the outer edge of the main body;

a longitudinal direction of each third slot is perpendicular to the extension direction of the main body, and a length of the third slot closer to an outer edge of the main body is longer than a length of the third slot further away from the outer edge of the main body.

With such arrangement, the closer to the wearer's ears that a loop is secured, the longer are the lengths of the first/third slots, as the loops are anchored at two ends of the first/third slots, sufficient distance is provided to keep minimal contact between the loops and the ears, therefore wearing such a face mask would be comfortable without the loops surrounding and rubbing the ears.

According to a further aspect of the present application, each of the second slots and each of the fourth slots is provided with a retaining hole at a free end, the diameter of the retaining hole is larger than the widths of second slot and fourth slot.

The retaining holes with larger diameter prevent the loops retained therein from slipping away to the second slots or the fourth slots.

According to a further aspect of the present application, each of the second slots and each of the fourth slots include a bending portion, the bending portion can bend the second/fourth slot in a direction perpendicular to the extension direction of the main body.

The bending portions limit movement of the loops secured on the hangers and prevent the loops from being offset.

According to a further aspect of the present application, the auxiliary unit comprises identifiers for each of the first hangers and each of the second hangers. Therefore, the wearer can identify the position of a hanger by touching the identifier.

According to a further aspect of the present application, the auxiliary unit comprises a recess for each hanger, the recess is arranged for hangers at the first/third slot.

When a wearer is securing the loops on the auxiliary unit, he pulls the loops through the first slot and the third slot, as each of the first slot and each of the third slot is formed with a broadened section by the recesses. The wearer can easily pass his fingers through the first slot and the third slot at the broadened section to hang the loop on respective hanger.

According to a further aspect of the present application, a recess configured for each of the first slots and each of the third slots, the recess is arranged to form a broaden section for each of the first and each of the third slots.

When a wearer wishes to use the auxiliary unit, he pulls the loops through the first slot and the third slot, as each of the first slot and each of the third slot is formed with a broadened section by the recesses, the wearer's fingers can easily pass through the first slot and the third slot at the broadened section to hang the loops on respective hangers.

According to a further aspect of the present application, each of the second and each of the fourth slots is arranged with a pair of teeth engaged with each other, each pair of teeth comprises a first tooth and a second tooth located on opposite side walls of each of the second and each of the fourth slots.

As the first tooth and the second tooth engage with each other, the loops in the second/fourth slot are prevented from slipping off.

According to a further aspect of the present application, the main body comprises a convex part and a flat part, the convex part is located between the first end and the second end and adjacent to outer edge of the main body. Therefore, the main body is a close fit on the wearer and the wearer is more comfortable.

According to a further aspect of the present application, the auxiliary unit further comprises four extension parts arranged at four corners of the main body respectively, wherein each of the extension parts is a sector of a circle being positioned with an arc side of the sector close to the wearer's ear, and the arc side of each extension part is fixed to the main body at one end and extends away from the main body at the other end, wherein the first hangers and the second hangers are arranged on the four extension parts, each of the first slots and each of the third slots are interrupted by the arc sides of the extension parts on the same end of the main body.

Therefore, the distance between the extension parts on same side of the main body increases as the arc sides extend, a receiving space is formed for the wearer's ear, thereby the loops secured on the hangers do not rub and bear down on top and bottom of ears, and it would be more comfortable to wear the face mask.

A detailed description of the hereinafter described embodiments of the disclosure are presented herein by way of exemplification and not limitation with reference to the Figures.

Referring to FIG. 1 , an auxiliary unit for loops of earloop face mask is provided by a first embodiment of the present application. The auxiliary unit includes a main body 10 with an oval structure including a first end 11 and an opposite second end 12 in an extension direction thereof, a first hanger 20, and a plurality of second hangers 30, wherein the first hanger 20 and the number of second hangers 30 are arranged on the main body 10.

Specifically, the first hanger 20 is arranged close to the first end of the main body 10, the several second hangers 30 are arranged close to the second end of the main body 10, and arranged in an extension direction of the oval structure. The first hanger 20 and the second hangers 30 are configured for hanging two loops 200 (refer to FIG. 3 ) of a face mask (not shown).

The first hanger 20 is formed by a first slot 21 and two second slots 22 connected end to end, wherein the first slot 21 is connected to the two second slots 22 at both ends, wherein one end of each second slot 22 is connected to the first slot 21, and the other end extends in a direction away from the second hangers 30. Each second hanger 30 is formed by a third slot 31 and two fourth slots 32 connected end to end, wherein the third slot 31 is connected to the two fourth slots 32 at both ends, wherein one end of each fourth slot 32 is connected to the first slot 31, and the other end extends in a direction away from the first hanger 20.

The main body 10 is made of an elastic sheet.

In this embodiment, the main body 10 is oval shaped, and the main body 10 can be shaped in other form that has an extension direction, e.g., rectangular.

When a wearer is putting on an earloop face mask, he hangs one of loops 200 of the mask on the first hanger 20, then puts the auxiliary unit 100 behind his head and takes the other loop 200 around the other side of head to meet the second hangers 30 of the auxiliary unit 100. Then the wearer chooses one of the multiple second hangers 30 to hang the other of the loops 200, depending on different head circumstances. Therefore, the face mask are secured to the auxiliary unit 100 instead of the ears, the ears do not experience the pressure of anchoring the loops 200.

The one loop 200 hung on the first hanger 20 goes through the first slot 21 and is retained in the two second slots 22, the other loop 200 hangs on one of the multiple second hangers 30 go through the third slot 31 and is retained in the two fourth slots 32. The connection between the auxiliary unit 100 and the face mask is stable due to opposite extending directions of the second slots 22 and the fourth slots 32.

Referring to FIGS. 2-3 , according to a second embodiment, the number of the first hangers 20 is equal to that of the second hangers 30, and the arrangement of the first hangers 20 is symmetrical to the arrangement of the second hangers 30. The wearer can hang the loops to one of the first hangers 20 and to one of the second hangers 30, therefore a broader range is provided for different head circumstances.

According to this embodiment, the longitudinal direction of the first slots 21 is perpendicular to the extension direction of the main body 10, the length of the first slot 21 of each first hanger 20 increases as it is closer to the outer edge of the main body 10. The longitudinal direction of third slots 31 is also perpendicular to the extension direction of the main body 10, and the length of the third slot 31 of each first hanger 20 increases as it becomes closer to the outer edge of the main body 10. Therefore, the closer to the wearer's ears, the longer are the first/third slots, thus sufficient distance is provided to maintain minimal contact between the loops 200 of the face mask and the ears. Therefore, wearing a face mask will be comfortable without the loops 200 surrounding and rubbing the ears.

In this embodiment, each of the second slots 22 is provided with a retaining hole 221 at the end away from the first slot 21, the diameter of the retaining hole 221 is larger than the width of the second slot 22; each of the fourth slots 32 is provided with a retaining hole 221 at the end away from the third slot 31, the diameter of the retaining hole 221 is larger than the width of the fourth slot 32. The loops 200 being retained in the retaining holes 211 will not slip to the second slots 22 or the fourth slots 32 due to the larger diameter.

Referring to FIG. 2 , according to a further embodiment, the main body 10 includes a convex part 13 and a flat part 14 connected with each other, wherein the convex part 13 is located between the first end and the second end and adjacent to outer edge of the main body 10, and the convex part 13 can be set in the middle of the main body 10.

According to a further embodiment, the convex part 13 is formed as an arc convex.

Preferably, the convex part 13 is shaped to fit a human head.

Therefore, the main body 10 is close fit with the wearer and the wearer is more comfortable.

Referring to FIG. 4 , according to a third embodiment, each of the second slots 22 and each of the fourth slots 32 includes a bending portion 222, each bending portion 222 divides second slot 22/fourth slot 32 into two sub-slots extending in different directions, wherein the two sub-slots are interconnected at the bending portion 222. The bending portions 222 limit movement of the loops 200 hung on the second slots 22 and the fourth slots 32 to prevent the loops 200 from being offset.

In this embodiment, the auxiliary unit 100 includes identifiers 40 for the hangers. Each hanger is arranged with corresponding identifiers 40.

In particular, the identifier 40 is comprised of marks that people can feel by touch, such as bumps.

It should be understood that the number or size of the identifiers 40 may vary according to different sizes of the hangers, for example, the number of identifiers 40 for each hanger decreases as the size of the hangers increases, therefore the wearer can identify the position of the hanger by touching the identifier 40.

In this embodiment, the auxiliary unit 100 includes a plurality of recesses 50, one for each hanger, each recess 50 is connected to the hanger at the first slot 21/third slot 31.

In particular, the recess 50 is arc shaped. It should be understood that, the recess 50 can be shaped in other forms that allow a wearer's finger to pass through, such as oval shaped or square shaped.

When a wearer is putting on the loops 200 on the auxiliary unit, he pulls the loops 200 to the hangers via the first slot 21 and the third slot 31. Since each of the first slot 21 and the third slot 31 is formed with a broadened section by the recesses 50, the wearer can easily pass his fingers through the first slot 21 and the third slot 31 at the broadened section to hang the loops 200 on hangers.

FIG. 5 shows a fourth embodiment, a first tooth 60 and a second tooth 70 being arranged on each of the second slot 22 and the fourth slot 32 of the auxiliary unit, wherein the first tooth 60 is engaged with the second tooth 70.

The arrangement of the first tooth 60 and the second tooth 70 prevent the loops 200 from slipping off.

A fifth embodiment is shown in FIG. 6 , the auxiliary unit 100 comprises four extension parts 80 arranged at four corners of the main body 10, each extension part 80 is fixed to the main body 10 at one end and extends away from the main body 10 at the other end, wherein the first hangers 20 and the second hangers 30 are arranged on the four extension parts 80 located on either side of the main body 10.

In this embodiment, the extension part 80 is shaped as a sector of a circle, it should be understood that, the extension part 80 can be shaped in other forms, as long as the two extension parts 80 on same side of the main body 10 have an increasing distance in the extension direction.

Therefore, as the distance between the extension parts 80 on same side of the main body 10 increases, a receiving space is formed for the wearer's ear, thereby the loops 200 hung on the hangers do not rub and bear down on top or bottom of ears, and it will be more comfortable to wear the face mask.

As shown in FIGS. 1-6 , when a wearer puts on an earloop face mask, he chooses one first hanger 20 from the multiple first hangers 20 to hook one of the loops 200 and selects a suitable second hanger 30 from the multiple second hangers 30 by recognizing the identifier 40. Then he put his finger through the recess 50 to lift the selected second hanger 30 and hang the other loop 200 thereon. Therefore, the multiple first hangers 20 and second hangers 30 provide a broader range for various human head circumstances, which improves the experience of wearing the face mask.

The retaining hole 221 and the symmetrical arrangement of the first hangers 20 and the second hangers 30 provide a stable hanging of the loops 200 on the hangers.

Therefore, with assistance of the auxiliary unit 100, the wear anchors the loops 200 of the earloop face mask to the auxiliary unit 100 instead of anchoring the loops 200 around the ears, which releases the ears from the loops of the face mask while maintaining a close fit between the face mask and face.

While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood for the skilled in the art that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions, or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims. 

What is claimed is:
 1. An auxiliary unit configured for a face mask comprising: a main body with a rectangle or an oval structure, the main body comprising a first end and a second end opposite to the first end, the first and the second ends being extendable in an extension direction thereof; and at least one first hanger and a plurality of second hangers arranged on the main body; wherein the at least one first hanger is arranged close to the first end, the plurality of second hangers are arranged close to the second end and arranged in the extension direction of the main body; the at least one first hanger and the plurality of second hangers are configured for securing and anchoring two loops of an earloop face mask; wherein each of the first hanger is formed by a first slot and two second slots connected end to end, wherein one end of each of the second slots is connected to one end of the first slot and the other end of each of the second slots extends in a direction away from the second hangers; wherein each of the plurality of second hangers is formed by a third slot and two fourth slots connected end to end, wherein one end of each of the fourth slots is connected to one end of the third slot and the other end of each of the fourth slots extends in a direction away from the first hanger.
 2. The auxiliary unit of claim 1, wherein a number of the first hangers is equal to a number of the second hangers, the first hangers are arranged in the extension direction of the main body and symmetrically relative to the second hangers.
 3. The auxiliary unit of claim 2, wherein a longitudinal direction of each first slot is perpendicular to the extension direction of the main body, and a length of the first slot closer to an outer edge of the main body is longer than a length of the first slot further away from the outer edge of the main body; a longitudinal direction of each third slot is perpendicular to the extension direction of the main body, and a length of the third slot closer to an outer edge of the main body is longer than a length of the third slot further away from the outer edge of the main body.
 4. The auxiliary unit of claim 2, wherein each of the second slots and each of the fourth slots is provided with a retaining hole at a free end, a diameter of the retaining hole is larger than a width of respective ones of the second slots and the fourth slots.
 5. The auxiliary unit of claim 2, wherein each of the second slots and each of the fourth slots include a bending portion, the bending portion is configured to bend the second and the fourth slots in a direction perpendicular to the extension direction of the main body.
 6. The auxiliary unit of claim 1, wherein the auxiliary unit comprises identifiers for each of the first hangers and each of the second hangers.
 7. The auxiliary unit of claim 2, wherein the auxiliary unit comprises a recess configured for each of the first and each of the third slots, the recess is arranged to form a broaden section for each of the first and each of the third slots.
 8. The auxiliary unit of claim 2, wherein each of the second and each of the fourth slots is arranged with a pair of teeth engaged with each other, each pair of teeth comprises a first tooth and a second tooth located on opposite side walls of each of the second and each of the fourth slots.
 9. The auxiliary unit of claim 1, wherein the main body comprises a convex part and a flat part, the convex part is located between the first end and the second end, the convex part is adjacent to an outer edge of the main body.
 10. The auxiliary unit of claim 9, further comprising four extension parts arranged at four corners of the main body respectively, wherein each of the extension parts is a sector of a circle being positioned with an arc side of the sector close to the wearer's ear, and the arc side of each extension part is fixed to the main body at one end and extends away from the main body at the other end, wherein the first hangers and the second hangers are arranged on the four extension parts, each of the first slots and the third slots are interrupted by the arc sides of the extension parts on the same end of the main body. 